Control device with predetermined successive positions



May 31, 1938.

F. MAES CONTROL DEVICE WITH PREDETERMINED SUCCESSIVE POSITIONS Filed Nov. 22, 1937 MN Rb retented May 31, 1938 2,118,890 v UNITED STATES PATENT :orriclz.

CONTROL DEVICE WITH PREDETERMINED SUCCESSIVE POSITIONS Frdric Maes, Brussels, Belgium, assignor to Servo- Frein Dewandre Socit Anonymc, Liege, Belgium Application November 22, 1937, Serial No. 175,993 In France November 27, 1936 6 Claims. (Cl.-121,40)

Myinvention relates to a device for the control the said pawl being always urged towards the of an apparatus of which the controlling memright-hand side (looking at Fig. l) by a spring 28.

her must successively occupy diiIerent predeter- A conduit 28 connects the bore II to the chammined positions. ber 25 of the cylinder 8. According to my invention the member intend- In a second bore 21, also transversely to the 5 ed to occupy successively different predeterbody 5 and arranged at the side of the bore I 8, mined positions is moved against the opposition slides a piston 28 subjected to the opposing action of resilient means by the action of a compressed of a spring 28. The bo y of the said piston 28 fluid which operates simultaneouslyamechanism is provided with ajtransverse aperture 80 of intended to limit each movement of the said elongated'formiinto which extends the rod 9 of 10 member, a locking member being provided in the piston 8. i g Y order to lock automatically and hold this mem- In the body of the piston 28 is also provided her in each of the positions which it can occupy a concentric aperture 31 in which can slide a when the action of the fluid is interrupted, the locking member 82. The latter is urged against release of this locking member to permit the the rod 8 by a spring 83 and is guided with lim- 15 return of this member to its initial position being ited longitudinal play by a pivot 35 supported in obtained when a driving member operating on the body of the said piston 28 and extending the said locking member is moved by the pressure into an eye 34 of the locking member 32. of the driving fluid. An aperture 36 provided in the cover I and an One form of embodiment of the invention will aperture 31 arranged in the body 5 below the be hereinafter described simply by way of expiston 28 are respectively intended for the adample with reference to the attached drawing, mission of compressed fluid into the cylinder 6 in which: and into the bore 21.

Fig. 1 is a view showing a longitudinal section The operation of the device is as iollows: of the assembly of the device; When the operator acts on the control dis- Fig. 2 is a view in section of the device along tributor provided on a conduit connecting the the line A-B of Fig. 1; source of compressed fluid to the aperture 38 Fig. 3 is a view in section of a detail 01 th of the device (not shown in the drawing), the device along the line CD of Fig. 1; fluid penetrates into the chamber 25 of the cylin- Fig. 4 is a viewin longitudinal section of an der 6 and also passes through the conduit 26 into 30 assembly of the device shown in one of its operthe bore l8. Under the action of the fluid the ating positions. piston 8 is forced backwhile movingthe rod 9;

According to these figures, in a body 5 is arwhile the piston I1 is also moved by the presranged a cylinder 6 closed by a cover I and in sure of the fluid and causes the pawl 20 to enwhich slides a piston 8 subjected to the opposigage in the first one of the teeth l8. When the 33 tion of a spring I 3. 4 7 end of #the said pawl comes in contact with the A rod 9 integral with the said piston is guided active face of the tooth ill on account of the proin the body 5 and is provided with a groove l4 gressive movement of the piston 8, the pawl 20 in which ca e a e a spur I (Fig. 2) pr v n is moved against the opposition of spring 23 and ing the rotation of the said rod and of the said slides in t t h "3 due t t clearance piston around their axis (Figs- 1 and sented by the eye 22 until the instant when the The rod 9 Controls its extremity fir t tooth arrives opposite the locking mem a receiflmg apparatus (not shown) has in its her 32 which engages in this latter tooth under cylindrical face, ratchet teeth I0 and II respecthe action of the Spring r tively notched in such a way as to present each In Spite of the action of the compressed fluid 45 an Opposite ratchet gear direction under the piston 8, the rod 9 of the device is In a bore l6 arranged transversely in the body 5 there slides, against the Opposition of Spring rendered stationary at this instant under the 24, a iston in the bod of which is arranged action of the pawl 20 in the first tooth I0 (Fig. 4). a trar i sverse aperture I9 31 elongated form per- If the pressure of the fluid m the cylinders 6 mitting the passage of the rod 9. In a notch i8 and is interrupted the piston 1 again takes up notched in the wall of this aperture can slide with its Position of rest under t action of'the Spring limited longitudinal play a pawl 20 provided with 24, While releasing, the p 2 which s oug t an eye 22 into which extends aguide pivot 2| supba k to its init al p s t by t sp n 3. whil ported in the body of the said piston I! (Fig. 3), the piston 8 is locked against the action oftthe 55 spring I! by the engagement oi: the locking member 32.

In order to obtain an additional displacement of the rod 8 corresponding to the magnitude of a tooth, the operator will act as previously on the control distributor of the driving fluid and the same efl'ects as those described above will be repeated. It will be .the same for each additional displacement to the value of one tooth which it is desired to impart to the rod 9.

Consequently the receiving apparatus which is connected at I! to the rod 0 will be moved by the amount of one tooth upon each operation of the operator. ,I

In order to bring back the device to its initial position the operator acts on a second distributor, not shown, provided on a conduit connecting the source of compressed fluid to the aperture 3L0! the cylinder 21. Under the eilfect of the driving fluid the piston 28 is forced back against the opposition of the spring 29 and in its movement moves the locking member 32 by means of the pivot 35.

The movement of this locking member releases the tooth. il which-was engaged while the rod 9 and the piston 8- are brought back to their initial position under the action or the spring IS. The action oithe fluid on the-piston 28 is then interrupted and the difierent members. of the device again take up the position shown .in'Fig. 1.

What I claim is:-

1. In a device for controlling the displacements of a member adapted to occupy successively different predetermined positions, a first fluid driven motor for operating the said member, notches provided on the said member, a second motor subjected to the effect of the fluid acting in the said first motor, and means operated by the said second motor and displaced against the action of a spring to cooperate with the said notches to limit each displacement of the: said member due to the action of the driving fluid.

2. In a device for controlling the displacements of a member adapted to occupy successively different predetermined positions, a first fluid oper-- ated motor for driving the said member, resilient means opposing the displacement of the said member, notches provided on the said member, a second motor subjected to the efiect of the fiuidacting in the said first motor, means driven by the said second motor to cooperate with the said. notches to limit each displacement of the said member due to the action of the drive fluid, and a locking member subjected to the action of a spring to cooperate with the said notches to automatically lock the first said member in each of the positions it may occupy.

3. In a device as claimedin claim 2, the provisionof fluid operated means for releasing the locking member and for allowing the member operated by the said first motor to return to its initial position.

4. In a device for controlling the displacementscooperate with one series of ratchet teeth when the piston in the said first cylinder is subjected to the action or the fluid, and means cooperating with the other series of ratchet teeth for automatically locking in position the piston rod of the piston in the said' first cylinder after the action of fluid has ceased in the latter.

, 5. In a device for controlling the displacements of a member adapted to occupy successively differe'nt predetermined positions, a first fluid operated drive cylinder, a piston in the said cylinder, an opposing spring for the said piston, a piston rod for the said piston, two oppositely directed series of ratchet teeth cut lengthwise into the said piston rod, a second fluid operated drive cylinder provided transversely of the said piston rod, a conduit to connect the said first cylinder to the said second cylinder, a piston in the said second cylinder, an opposing spring for the latter piston, a pawl supported by the latter piston to cooperate with one series of ratchet teeth when the piston in the said first cylinder is subjected to the action of the fluid, a third drive cylinder provided transversely of the piston rod of the piston in the said first cylinder, a spring loaded piston in the said third cylinder, a spring loaded pawl-like locking member supported with limited axial play in the latter piston to automatically engage the other series of ratchet teeth to lock the piston rod of the piston of the said first cylinder in position after the action of the fluid has ceased in the said first cylinder, the latter locking member being released when the third said piston is subjected to the action of the driving fluid, to allow the .piston in the said first cylinder to return to its initial position under the effect of the opposing spring acting upon the latter piston.

6. In a device as claimed in claim 5, the arrangement characterized in that the pawl associated with the piston in the said second cylinder is supported with transverse play with respect to the latter piston.

FREDERIC MAES. 

